US738747A - Brush-holder for dynamo-electric machines. - Google Patents

Description

No. 738,747. PATENTED SEPT. 15, 1903. H. M. ACLY. BRUSH HOLDER FUR DYNAMO ELECTRIC MACHINES. APPLICATION TILED JAN. a1, 1903.

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UNITED in Patented September 15, 190d.

BALILENAT OrFIcE.

HARRY M. ACLY, OF PITTSFIELD, MASSACHUSETTS, ASSIGNOR TO STANLEY ELECTRIC MANUFACTURING COMPANY, OF PITTSFIELD, MASSACHU- SETTS, A CORPORATION OF NEW JERSEY.

BRUSH-HOLDER FOR DYNAMO-ELECTRIC MACHINES.

SPECIFICATION forming part of Letters Patent No. 738,747, dated September 15, 1903. Application filed January 31,1903. Serial No 141,353. (No model.)

To all whom it may concern.-

Beit known that I, HARRY M. ACLY, a citizen of the United States, and a resident of Pittsfield, Massachusetts, have invented certain new and useful Improvements in Brush- Holders for Dynamo-Electric Machines, of which the following is a specification.

My invention relates to brushholders for dynamo electric machines; and its object is [o to provide a simple and efficient construction and arrangement of parts whereby an even pressure of the brush on the commutator or collector ringis readily and delicately ad j ustable, the brush may be easily removed and I 5 replaced without altering the pressure thereon, the pressure of the brush may be accurately indicated, and all current and consequent heating are diverted from the spring.

Referring to the drawings, Figure l is an end elevation of a brush embodying my invention. Fig. 2 is a side elevation. Fig. 3 is a plan view. Fig. 4 is a side elevation in cross-section on line a a, Fig. 3; and Fig. 5 is a side elevation showing the pressure device swung away to permit the removal of the brush.

In the drawings, A represents the inclosing shell, in which the brush B is vertically movable.

C is a clamping-lug whereby the shell A is firmly attached to the brush-holder rod.

D is a follower pressed upon brush B by spring E and carried by guide-rod F.

G is a stop on guide-rod F limiting the downward movement of the follower D. G

is also used as a means for lifting the follower when the carbon is to be removed.

II is the support for spring E and acts as guide for the follower D and the guide-rod F.

This spring-support is screw-threaded on its outer surface and has a milled head h.

I is a casting into which I-I screws and is pivoted at one end on pin J, which is carried by lug K on the inclosing shell A. At the other end of the casting I is the lock-nut L on the screw-threaded pin M.

N isa slot in A in which L locks. O is a lock-nut carried by the spring-support H, which looks H in position with reference to casting I. Y

P is a flexible connection or pig-tail electrically connecting follower D to shell A.

The operation of the device will be clear from the foregoing. The pressure of spring E on brush-follower D may be readily and' delicately adjusted by screwing 11 into or out of I, and when His once set it is firmly locked in position by nut Q. It is evident that the distance that guide-rod F projects above h is a measure of the compression of the spring, and consequently of the brush pressure. Hence the position of F affords a ready inclication as to the equality of pressure on the several brushes. If desired, the positions of F may be calibrated and ascale marked there on to read the brush-pressure directly.

If it is desired to remove the brush, nut L is loosened and the entire upper part of the device may be swung away, rotating on pin J, as shown in Fig. 5 allowing a ready removal of the brush. A isslotted, as shown at Q, to facilitate the removal of the brush. It will be noticed that the brush may be removed without altering the setting of II with regard to I. Hence when the brush is replaced 7 5 and L again locks I into position no further adjustment of pressure is necessary.

Pig-tail P shunts the current from spring E, and consequently prevents deterioration of the spring by heating.

If several brushes are to be mounted side by side on thebrush-holder rod, as is common in directcurrent machines, lug K and slot N would preferably be placed on the opposite broad sides of shell A instead of on the narrow sides, as shown in the'drawings. The swing of casting I would obviously then be in a plane perpendicular to that shown in Fig. 5, thus avoiding interference with the brush beside it. I prefer the arrangement shown, however, with alternating-current machines in which but a single brush is usually mounted on each brush-holder rod.

I do not desire to be limited to the specific embodiment of my invention shown, since 9 5 changes therein which attain the objects of my invention and are within the scope of the appended claims may readily be made by those skilled in the art.

Having thus fully described my invention, what I claim, and desire to protect by Letters Patent, is-

1. In a brush-holder for dynamo-electric machines, a metallic shell, a brush movable therein, a spring-actuated follower carried by a guide-rod and pressing upon the brush, a guide for said follower and guide-rod, said guide supporting the spring and being adjustable in position with reference to the follower and guide-rod, and a pin carried by the metallic shell upon which the follower and guide are rotatable away from the brush.

2. In a brush holder for dynamo electric machines, a metallic shell, a brush movable therein, a spring-actuated follower pressing on said brush, a guide for said follower inelosing and supporting the spring, and ablock supporting said guide and in which said guide is adjustable, said block being pivoted on the metallic shell.

3. In a brushholder for dynamo electric machines, a metallic shell, a brush movable therein, a spring-actuated follower pressing on said brush, a guide for said follower, said guide supporting the spring and being adjustable in regard to the follower so as to vary the spring-pressure, a guiderod attached to the follower and extending through and beyond the guide, said guide-rod carrying a stop which limits the relative motion of guide and follower in one direction, and a pin carried by the metallic shell upon which the guide and follower are rotatable away from the brush.

4. In a brush -holder for dynamo-electric machines, a metallic shell, a brush movable therein, a spring-actuated follower pressing 011 said brush, a guide for the follower supporting the spring, a guide-rod attached to the follower extending outside the guide, and

a block supporting said guide and in which the said guide is adjustable, said block being pivoted on the metallic shell.

5. In a brush-holder for dynamoelectric machines, a metallic shell, a brush movable therein, a spring-actuated follower pressing on said brush, a guide for said follower supporting and inclosing the spring, said guide being screw-threaded on its outer surface, a member into which said guide is screwed and a guide attached to said follower and extending through and beyond the said guide.

6. In a brush -holder for dynamo electric machines, a metallic shell, a brush movable therein, a follower resting on the brush, a guide-rod attached to said follower, a spiral spring surrounding said guide-rod and pressin g the follower against the brush, and a guide for said follower inclosin g and supporting the spiral spring, said guide being adjustable in position in the direction of the movement of the brush in the metallic shell.

'7. In a brush -holder for dynamoelectric machines, the combination of a brush, a follower, a spring engaging the same, a threaded tube engaging and surrounding the spring, a guide-rod secured to the follower and pro- 3' ectin g beyond said tube, a member into which said tube is screwed, and means for locking the tube upon said member where desired.

8. In a brush-holder for dynamo electric machines, the combination of a brush, a follower, a spring engaging the same, a threaded tube engaging and surrounding the spring, a member into which said tube is screwed, a guide-rod secured to the follower and passing through the end of said tube.

Signed at Pittsfield, Massachusetts, this 22d day of January, 1903.

HARRY M. AOLY.

Witnesses:

RICHARD EYRE, R. E. I-IAYNEs.

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